Muffler



A rils, 1924. a

. A. E. BRICKER MUFFLER Filed July 17 1919 Patented Apr. 8, 1924.

UNITED STATES ALBERT E. BRICKER,.OF ROCHESTER, NEW YORK.

MUFFLER.

Application filed July 17, 1919.

To all whom it may concern:

Be it known that I, ALBERT E. BRI KER. a citizen of the United States, and resident of Rochester, in the. county of Monroe and State of New York, have invented certain new and useful Improvements in Mufllers, of which the following is a specification.

The present invention relates to mufl'lers for the fluid discharges of steam, gas, air or the fluid motors and more particularly to the type in which the muffler is provided with a passageway formed by a plurality of chambers in which the fluid successively expands, an object of this invention being to provide a construction which does not create any back pressure while at the same time eliminating all sound due to the discharge.

To this and other ends, the invention consists of certain parts and combinations of 2 parts, all of which will be hereinafter described, the novel features being pointed out in the appended claims.

In the drawings:

Fig. 1 is an axial section through a muf- 7 tier designed for a steam engine in which the mufiier is shown as being connected to the exhaust of the engine;

Fig. 2 is a section on the line 2'2, Fig. 1;

Fig. 3 is a detailview of the intake end of the mufiler;

Figs. 4 and 5 are side elevations partly in section of two interior walls of the mufiler; and

Fig. 6 is a view in side elevation of the It has been suggested prior to this invention to provide in a muffler a passageway formed by a plurality of successive chambers into which the discharge fluid is conducted and expanded. In prior constructions of this type, it is necessary especially in steam mufilers to restrict the passageway between the different chambers to openings having areas less than twice the intake of the steam to the engine if any muiiling action isto be obtained and, in so restricting the areas between the chambers, a back pressure is produced by the mufller.

According to this invention, a structure is provided in which the area of the openings between the successive chambers may be at least two and one-half times the area of the intake to the engine so that no back pressure will be present in the mufiler, provision be- 55 mg made at the intake of the mufiier for di- Serial No. 311,560.

viding the fluid into jets or streams which are caused to travel one against the other in opposite directions and in this way prevent the noise or sound in the exhaust.

Referring to the embodiment of the invention herein shown, the mufl'ler comprises an outer casing formed by two sections 1 internally threaded at their ends, their adjacent ends being connected by an externally threaded sleeve 2. The intake end 3 connects with the engine 1 and the outlet end 5 connects if desired with an outlet pipe 6. The passageway through the mufller is, in this instance, formed by a hollow frustroconical member 7 surrounding a tubular member 8 providing an expansion chamber 9 between them. At the end adjacent the intake of the mufiler, a partition 10 is provided which is preferably in the form of a disk externally threaded and engaging internal threads on the frustro conical member 7. This disk is provided with an opening 11 surrounded by an externally threaded bore 12, the walls of which engage with the internal threads 011 the lower end of the tubular member 8. The opposite end of the frustro-conical member 7 has a cylindrical bore 13 which snugly fits the adjacent end of the tubular member 8 so that the chamber 9 is closed at both ends. The opening 11 in the partition 10 forming the intake to the passageway through the mufiler has a diameter less than the internal diameter of the tubular member 8 so that the fluid passing through the intake opening 11 expands into the chamber let formed by the tubular member 8 near its opposite end. The tubular member 8 is provided with outlets 15, the cross sectional area of all of these outlets combined being about two and one-half times the cross sectional area of the inlet to the steam engine (not shown) and the crosssectional area of the intake opening 11 being also preferably two and one-half times the area of the inlet to the steam engine. The frustro-conical member 7 rests at one end against an internal annular shoulder 16 near the intake end of the muffler. Owing to the shape of the frustro-conical member 7, and its central arrangement within the casing, a chamber 17 is provided about the frustro-conical member 7 and this chamber communicates with the chamber 9 through a plurality of ports or openings 18, the combined cross sectional area of which is subtill charge end of the mufiler, this disk 19 also acting to close the adjacent end of the tubular member 8 and to this end havnw an externally threaded Pl0360t1011 21 which en'- gages internal threads on the tubular member 8. The partition 19 is provided with ports or openings 22, the combined area ot which is substantially equal to two and onehalf times the area of the intake of the engine. It will thus be seen that the chambered passageway through the mufiier does not act to produce a back pressure. However. with such an arrangement there would be a hissing sound produced by the discharge it no means were provided to prevent such sound.

To prevent this hissing sound. means is arrangei'l at the intake oi the mullier to divide the tluid into a plurality of streams and to cause said streams to travel in opposite directions one against the other, tor it has been found that when two fluid streams are caused to intersect, the hissing sound is eliminated. In this instance. this result is obtained by providing at the intake end or" the mutiler, an annular c iamber 23 in which an annular disk Q-lis centrally arrange 1, this disk having a greater diameter than the intake end 11 oi? the passageway through the mufiier and being spaced from the sine wall of the chamber to provide a passage about said disk, thus producing an annular stream which impinges on the partition 10 and is turned inwardly and rearwardly toward the inner face of the disk 24-. The disk is also provided with a central port to form a stream which discharges in line with the opening 11 against the stream passing toward the disk 24- in an opposite direction, lugs or supports 26 being en'iployed for supporting the disk 21- in spaced relation to and from the partition to.

The multlcr connected to a tluid exhaust and the fluid pas in a stream tin-ough the central port in the disk L t and also around the edges of the disk being dctlcctcd toward the disk by the partition 10 about the opening 11. The cross sectional area of these fluid passageways is substantially twice the intake area of the engine so that the disk does not produce any back pres sure. The two streams intersect from opposite directions on the opposite time of the disk and then pass through the intake end of the chambered passageway of the mutiler. In this passageway, the fluid is caused to expand successively in a number of chant bers before being discharged to the at1nosphere thus rendering it lifeless when it is sues to the atmosphere. Through this arrangement, a mutlier is provided which does not create any back pressure and which at the same time eliminates all sounds.

What I claim as my invention and desire to secure by Letters Patent is:

1. An exhaust mutller having at its intake a that disk provided with a central opening and spaced from the wall oi the mutllcr to provide an annular opening about the edge of the disk and the diameter of the disk being less than the smallest diameter of the intake opening, the muttler also having a passageway beyond said disk of less diameter than the disk and a wall about said passageway beyond the disk and in such a position that the fluid will flow in straight lines through the intake opening around the edge of the disk toward the wall to be deflected rearwardly toward the disk and to intersect from an opposite direction the fluid passing through the central opening.

2. A muiller comprising a casing having two partitions, one of which is formed with a central opening and the other of which is formed by an annular series o't openings, a tubular member connecting the partitions and provided with openings near one end. the other end communicating with said central opening in one of the partitions. and a trustro-conical member surrounding said tubular member to provide a chamber about said tubular member and a chamber between the wall of the casing and the frustro-conical member, said last named chamber communicating with the annular series of openings and said frustro-conical member also being provided with openings forming communication between the last mentioned chan'ibcr and the chamber that is provided between the trustro-conical member and the tubular member.

3. A muttler comprising two members detachably connected and each provided with an internal shoulder, two partitions each resting upon one of said shoulders, one of said partitions having a central opening and the other an annular series ot openings and tubular member connecting the partitions and communicating with the central opening, said tubular member having openings in its walls, and a second member surrounding the tubular member and providing two chambers, one between the wall of the casing and one about the tubular member, said second member having openings in its walls providing comi'nunication between the two chambers and the chamber about said sec- 0nd named member communicating with the annular series of openings in the partition.

ALBERT E. BRICKER. 

